Unable to install Itunes V10.

I successfully installed Itunes V10 but was unable to access pod casts or Itunes store so I deinstalled it and then attempted to reinstall. When I attempted the reinstall I get this error: iTunes64Setup[1].exe is not a valid Win32 application. I looked up the forum and saw this issue was previously resolved by having a friend download V10 on USB and attempting to install from here, I have tried this option but am still getting the same error. Can anyone give me any assistance please?